采用稀土氧化物Pr6O11对ZnO-Bi2O3系压敏材料进行了改性研究, 探讨了Pr6O11对该材料
主要性能及微观结构的影响. 结果表明, Pr6O11掺杂量较小时, 能够显著提高ZnO压敏材料非线性系数, 减小漏电流, 并基本不影响压敏电压. 当Pr6O11掺杂达到一定量时, 在保持较高非线性系数, 较小漏电流的同时, 压敏电压与不含Pr6O11的ZnO压敏材料相比提高约60%; XRD、SEM等分析表明Pr6O11的引入改变了原有材料的微观结构组织, 使该材料微观结构中ZnO晶粒尺寸减小,
分布均匀、致密.
The ZnO-Bi2O3 system varistors were modified by doping with rare-earth oxide Pr6O11 and their electrical properties and microstructure were investigated. The results of experiment indicate that adding a small scale of Pr6O11 would increase the nonlinear coefficient greatly and decrease the leakage current with no change in threshold voltage. When the Pr6O11 content reaches to 7wt%, the threshold voltage increases by about 60%, whereas the leakage current and nonlinear coefficient are unchangable. The SEM and XRD analyses testify that Pr6O11 makes the microstructure of the materials more uniform and compact.
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